Mastered For iTunes is an initiative put in place by Apple to provide the highest quality version of your music when downloaded from the iTunes store, or streamed from Apple Music and Apple Radio. By following recommended guidelines and additional tests of your music, during the mastering phase, the best result for the consumer of your music (fans) is provided for. Only a mastering studio (and it's associated engineer) that have been granted this status by Apple are placed on the White List of Official MFiT Providers. This list is available to record labels and the like.